Finance supports the optimization of marine industrial structure Changes and optimization of industrial structure 并列题名：Changes and optimization of industrial structure Analysis of tax effect on optimizing industrial structure Research on marine industrial structure Evaluation and optimization of China's tax structure Research on the optimization of China's foreign trade structure 并列题名：Research on the optimization of China's foreign trade structure New change of international division of labor and industrial structure New path of industrialization and the optimization and upgrading of the industrial structure